Question:
Which one or more of the following is/are characteristic of r-selected animals?
Which one or more of the following is/are characteristic of r-selected animals?
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Mnemonic: \textbf{A}ltricial = \textbf{A}ssistance needed (eyes closed, naked, nest-bound). \textbf{P}recocial = \textbf{P}repared at birth (eyes open, downy, mobile).
Updated On: Aug 26, 2025
- They have a long lifespan.
- They produce a large number of offspring in each reproductive event.
- They produce a few large bodied offspring in each reproductive event.
- They reproduce at a young age.
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The Correct Option is B, D
Solution and Explanation
Step 1: Recall altricial vs. precocial.
Altricial chicks hatch underdeveloped: eyes often closed, body largely naked (down absent or very sparse), immobile, and highly dependent on parental care.
Precocial chicks hatch well-developed: eyes open, covered with down, mobile soon after hatching, and more independent.
Step 2: Match features.
(A) Eyes open \Rightarrow precocial \Rightarrow not altricial.
(B) Eyes closed \Rightarrow characteristic of altricial.
(C) Down present \Rightarrow precocial.
(D) Down absent (or very sparse) \Rightarrow altricial. Final Answer:
\[ \boxed{\text{(B) and (D)}} \]
Altricial chicks hatch underdeveloped: eyes often closed, body largely naked (down absent or very sparse), immobile, and highly dependent on parental care.
Precocial chicks hatch well-developed: eyes open, covered with down, mobile soon after hatching, and more independent.
Step 2: Match features.
(A) Eyes open \Rightarrow precocial \Rightarrow not altricial.
(B) Eyes closed \Rightarrow characteristic of altricial.
(C) Down present \Rightarrow precocial.
(D) Down absent (or very sparse) \Rightarrow altricial. Final Answer:
\[ \boxed{\text{(B) and (D)}} \]
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